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If needed you can check out Facebook's Brand Usage Terms: 

1. Avoid using Brand Assets in a way that suggests any type of association or partnership with Facebook, or approval, sponsorship, or endorsement by Facebook.
2. Don’t present a Brand Asset in a way that makes it the most distinctive or prominent feature on your web page, printed material, or other content.
3. Don’t use Facebook’s Brand Assets in a way that is deceptive, harmful, obscene, or otherwise objectionable to Facebook.
4. You may not present or feature the Brand Assets on websites containing content associated with pornography, gambling, or illegal activities.
5. You must keep sufficient space around our Brand Assets so they appear clean and uncluttered.
6. You may not combine our Brand Assets, or elements of our Brand Assets, with your own name or mark or generic terms.
7. Do not use trademarks, logos, or other content that is confusingly similar to the Brand Assets.
8. You may not attempt to get rights in the Brand Assets, or any confusingly similar approximations, whether by trademark registration, domain name registration, or otherwise.
9. We do not require the use of either the ® or the ™ attribution symbols with our Brand Assets.
10. All use of Brand Assets is subject to Facebook’s terms and policies, including the Statement of Rights and Responsibilities and the Privacy Policy.